Objective: We assessed the utility of plasma B-type natriuretic peptide (BNP) in infants with persistent pulmonary hypertension of the newborn (PPHN) in the prediction of inhaled nitric oxide (iNO) requirement.
Methods: This prospective study involved neonates (gestational age ≥ 34 weeks) with PPHN and confirmatory echocardiographic findings. Plasma BNP was assayed once within 12 hours of meeting criteria for iNO requirements and twice every 24 to 48 hours thereafter.
Results: Infants requiring iNO (n = 14) had higher first BNP levels compared with others (n = 5) (455.5 ± 350.6 vs. 30.1 ± 25.3 ng/dL, p < 0.003). The sensitivity, specificity, positive and negative predictive values, and 95% confidence intervals (CI) for plasma BNP greater than 30 ng/dL to predict iNO requirement were 100 (85-100), 80 (37-80), 94 (80-94), and 100 (46-100)%, respectively. Corresponding values at a cut-off plasma BNP concentration greater than 85 ng/dL were 79 (62-79), 100 (53-100), 100 (79-100), and 63 (33-63)%, respectively.
Conclusion: BNP had excellent sensitivity and negative predictive value for iNO requirement and above 30 ng/dl maybe a useful prognostic biomarker in PPHN.
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